const { test, expect } = require('@playwright/test');
const { openClassic } = require('./helpers/classic-fixture');

function wavTone() {
  const rate = 48000, frames = rate;
  const b = Buffer.alloc(44 + frames * 2);
  b.write('RIFF', 0); b.writeUInt32LE(b.length - 8, 4); b.write('WAVEfmt ', 8);
  b.writeUInt32LE(16, 16); b.writeUInt16LE(1, 20); b.writeUInt16LE(1, 22);
  b.writeUInt32LE(rate, 24); b.writeUInt32LE(rate * 2, 28); b.writeUInt16LE(2, 32); b.writeUInt16LE(16, 34);
  b.write('data', 36); b.writeUInt32LE(frames * 2, 40);
  for (let i = 0; i < frames; i++) b.writeInt16LE(Math.round(Math.sin(2 * Math.PI * 440 * i / rate) * 9000), 44 + i * 2);
  return b;
}

test('JamesDSP stays lazy when off, plays a fixture tone when enabled, and persists settings', async ({ page }) => {
  await page.route('**/tone.wav', route => route.fulfill({ contentType: 'audio/wav', body: wavTone() }));
  await openClassic(page);
  await page.evaluate(() => {
    window.__audioContexts = 0;
    const AC = window.AudioContext;
    window.AudioContext = class extends AC { constructor(...args) { super(...args); window.__audioContexts++; } };
  });
  expect(await page.evaluate(() => window.__audioContexts)).toBe(0);
  await page.locator('.nav-item[data-view="settings"]').click();
  await page.locator('[data-section="jamesdsp"]').click();
  await page.locator('#setJamesDsp').check();
  await expect.poll(() => page.evaluate(() => window.__audioContexts)).toBe(1);
  await page.evaluate(async () => {
    const audio = document.getElementById('audio');
    Player.mode = 'audio'; Player.master = audio; Player.secondary = null;
    await JamesDSP.activate(audio);
    audio.src = '/tone.wav'; audio.load(); await audio.play();
  });
  await expect.poll(() => page.locator('#audio').evaluate(a => a.currentTime)).toBeGreaterThan(0.1);
  await page.waitForTimeout(600);
  const reloaded = await page.context().newPage();
  await reloaded.goto('/');
  await reloaded.locator('.nav-item[data-view="settings"]').click();
  await expect(reloaded.locator('[data-section="jamesdsp"]')).toBeVisible();
  await reloaded.locator('[data-section="jamesdsp"]').click();
  await expect(reloaded.locator('#setJamesDsp')).toBeChecked();
  await expect(reloaded.locator('#setJamesDspPreset')).toHaveValue('Flat');
});